John isaac thornycroft



(No Model.)

2 sneak-sh et 1. J. I. THORNYGROFT.

' RUDDER FOR STEERING VESSELS.

N0."348,070 Patented Aug. 24, 1886.,

N. FETERS Fholo-Uihognpher, wumn m", ac

(No Model.) 2 Sheets-Sheet 2.

J. I. THORNYOROPT. RUDDER FOR STEERING VESSELS.

No. 348,070. Patented Aug. 24, 1886.-

Wiznesses l I Inventor %/M, Q%W. 1 ms w.

N. PEIERS. Photo-Wampum Wnhingbn, 11c

, U I ED STATES PATENT Orrice.

JOHN ISAAC THORNYOROFT, OF OHISWVIOK, COUNTY OF MIDDLESEX,

5 ENGLAND.

RUDDER FOR STEERING VESSELS.

SPEGIFIGA'JJION forming part of Letters Patent No. 348,070, dated August 24, 1886.

Application filed November 25, 1885. Se1ialNo.183,915. (No model.) Patented in France Octohc1'7,1885, No.17LE-3l; in Sweden October 13, 1885, No. 341; in Italy December 31,1885, XXXVII, 27, XXXVII, 427; in Canada January 18, 1886, No. 23,232, and

in Austria-Hungary March 18, 1886, No. 42,419.

Vessels, (for which I have received Letters.

Patent in Sweden, No. 341, dated October 13,

' 1885; France, by certificate of addition, dated November l7,1885,to Patent No. 171, 531, dated October 7, 1885; Canada, No. 23, 232, dated January 18,1886; Italy, by certificate of addition dated December 31, 1885, Reg. Att. Vol. XXXVII, No. 27, to patent dated December 31, 1885, Reg. Att. Vol. XXXVII, No. 427,) of which the followingisa specification.

The drawings hereunto annexed illustratea modification of the invention describedin the specification of my application for Letters Patent filed on the 20th day of October, 1885, Serial N 0. 180,400.

Figure 1 is a side elevation, Fig. 2 an end elevation, and Fig. 3 a plan or top view, of a navigable vessel with my present arrangement of steering apparatus.

As described in my said previous specification, a navigable vessel contructed with an external hollow or recess at the under part of the stern, to partly receive the propeller or propellers,is provided at each side thereof with a rudder, the two rudders being connected in such a manner as to operate simultaneously.

Now, my present invention has for its ob jeot to enable a vessel to be efficiently steered by a somewhat more simple and compact arrangement of parts than illustrated in the previous specification.

1 is the vessel; 2, the external hollow or recess at the under part of the stern, and 3 a screwpropeller situated partly within the hollow or recess 2. Accordingto my present arrangement only one rudder, 4, is used. This single rudder in the modification illustrated is of curved form in vertical transverse section. It is arranged at one side of the propeller in such a manner that when the propeller is driven,

whether ahead or astern, water leaving it will act upon the rudder.

5 is the rudder-head, extending upward through a stuffingbox, 6, and provided at its upper end with a toothed sector, 7, in gear wit-h a worm, 8, on a shaft, 9, operated by a hand-wheel, 10. As shown in the drawings, the axis about which the rudder turns is inclined toa vertical plane coincident with the longitudinal center line of the vessel, which arrangement admits of the parts being comp'actly situated and conveniently operated; but the axis may be vertical, if desired.

The rudder may be operated in any other convenient manner than that illustrated.

11 is a frame or support for carrying the outer portion of the propeller-shaft.

As I have already pointed out, my present invention differs-from that described and claimed in my previous application filed October 20, 1885, Serial No. 180,400, in that the present case covers a single rudder arranged on one side of thepropeller, whereas the former case covers two rudders, one on each side of the propeller. The single-rudder arrangement is applicable in many cases where simplicity and cheapness are importantf 'or example, in the caseof small vessels-while the double-rudder arrangement, by which, of

course, a more powerful steering effect may be obtained, is applicable to larger vessels.

What I claim is 1. In a navigable vessel, the combination,

with a propeller or propellers, of a rudder situated on one side thereof, projecting or ex- 7 tending above as well as forward and abaftof said propeller or propellers, substantially as described.

2. A navigable vessel constructed with an external hollow or recess at the under part of the stern, and having a propeller or propellers arranged to revolve in or partly in said recess, in combination with a rudder situated abreast of said propeller or propellers on one side thereof, substantially as described. 3. In a navigable vessel, the combination, with a propeller or propellers, of a rudder situated on one side thereof, which rudder has the form of a hollow cylinder, the axis of which I to the propeller-shaft, whereby the parts may to is practically coincident with the propellerbe more compactly arranged, substantially as shaft, substantially as described. described.

4. In a navigable vessel, the combination, JOHN ISAAC THORNYCROFT. 5 with a propeller or propellers, of a rudder sit- Witnesses: V

uated on oneside thereof, the axis about which F. J. BROUGHAM, said rudder turns being inclined toward a ver- 46 Lincolns Inn Fields, London. tical line through the propeller-shaft, and be- WM. TIIOS. MARSHALL,

ing situated in a vertical plane perpendicular 2 Popes Head Alley, Oornhill, London, Gentn. 

